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timekeeping: Use syscore_ops instead of sysdev class and sysdev 

The timekeeping subsystem uses a sysdev class and a sysdev for
executing timekeeping_suspend() after interrupts have been turned off
on the boot CPU (during system suspend) and for executing
timekeeping_resume() before turning on interrupts on the boot CPU
(during system resume).  However, since both of these functions
ignore their arguments, the entire mechanism may be replaced with a
struct syscore_ops object which is simpler.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Rafael J. Wysocki 2011-03-23 22:16:04 +01:00
parent f3c6ea1b06
commit e1a85b2c51
1 changed files with 8 additions and 19 deletions
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27
kernel/time/timekeeping.c
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@ -14,7 +14,7 @@
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/sysdev.h>
#include <linux/syscore_ops.h>
#include <linux/clocksource.h>
#include <linux/jiffies.h>
#include <linux/time.h>
@ -597,13 +597,12 @@ static struct timespec timekeeping_suspend_time;
/**
* timekeeping_resume - Resumes the generic timekeeping subsystem.
* @dev: unused
*
* This is for the generic clocksource timekeeping.
* xtime/wall_to_monotonic/jiffies/etc are
* still managed by arch specific suspend/resume code.
*/
static int timekeeping_resume(struct sys_device *dev)
static void timekeeping_resume(void)
{
unsigned long flags;
struct timespec ts;
@ -632,11 +631,9 @@ static int timekeeping_resume(struct sys_device *dev)
/* Resume hrtimers */
hres_timers_resume();
return 0;
}
static int timekeeping_suspend(struct sys_device *dev, pm_message_t state)
static int timekeeping_suspend(void)
{
unsigned long flags;
@ -654,26 +651,18 @@ static int timekeeping_suspend(struct sys_device *dev, pm_message_t state)
}
/* sysfs resume/suspend bits for timekeeping */
static struct sysdev_class timekeeping_sysclass = {
.name = "timekeeping",
static struct syscore_ops timekeeping_syscore_ops = {
.resume = timekeeping_resume,
.suspend = timekeeping_suspend,
};
static struct sys_device device_timer = {
.id = 0,
.cls = &timekeeping_sysclass,
};
static int __init timekeeping_init_device(void)
static int __init timekeeping_init_ops(void)
{
int error = sysdev_class_register(&timekeeping_sysclass);
if (!error)
error = sysdev_register(&device_timer);
return error;
register_syscore_ops(&timekeeping_syscore_ops);
return 0;
}
device_initcall(timekeeping_init_device);
device_initcall(timekeeping_init_ops);
/*
* If the error is already larger, we look ahead even further